Optimisation of the ultrasound-assisted extraction of betalains and polyphenols from Amaranthus hypochondriacus var. Nutrisol

Tabio-García, Danger; Paraguay‐Delgado, F.; Sánchez‐Madrigal, Miguel Ángel; Quintero‐Ramos, Armando; Meléndez‐Pizarro, Carmen O.; Ruíz-Gutiérrez, Martha Graciela; Espitia-Rangel, Eduardo

doi:10.1016/j.ultsonch.2021.105680

Cited by 20 publications

(7 citation statements)

References 68 publications

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“…Temperature (20–54 °C) and ultrasonic power density (76–274 W/L, frequency 20 kHz) were the variables that were optimized, while solute–solvent ratio and pH were constant (1:30 and 5, respectively). Maximum yields of 83 % and 21 % for pigments and antioxidants were achieved and confirm ultrasound as a fast and effective method for high added value extraction method from biomass matter [12] .…”

supporting

confidence: 60%

Trends in sonochemistry and sonoprocessing in North America – Preface

Patience

Galli

Boffito

2022

Ultrasonics Sonochemistry

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supporting

confidence: 60%

Trends in sonochemistry and sonoprocessing in North America – Preface

Patience

Galli

Boffito

2022

Ultrasonics Sonochemistry

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“…This optimal frequency is 2.25 MHz for this experiment. This frequency is higher in comparison with the extraction of BTs reported by other authors, for instance, Tabio‐García et al (2021) extracted BTs from Amaranthus hypochondriacus var. Nutrisol, concluding that at 20 kHz, the extraction is function of ultrasonic power densities and temperature; similar results were reported by Silva et al (2020) in its study of the extraction of colorants from Beta vulgaris L. at 25 kHz.…”

Section: Discussionmentioning

confidence: 53%

Influence of frequency on ultrasound‐assisted extraction of betalains from Stenocereus queretaroensis peel

Soto-Castro

Castellanos

2022

J Food Process Engineering

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Optimization of green extraction to obtain natural colorants is relevant as the stability of colors can be influenced by the energy and temperature of the extraction process. The influence of frequency on ultrasound-assisted extraction of betalains from Stenocereus queretaroensis peel in Opuntia ficus indica mucilage at room temperature is analyzed. Frequencies of 0.04, 2.25, 7.5, and 15 MHz, higher than those commonly used (0.02-0.5 MHz), were employed in this work. A dependence of extraction efficiency on frequency applied was found, being 2.25 MHz the optimal frequency with the highest extraction yields and with an 8 C increase in the temperature of the system, without requiring cooling systems, favored by the extraction sequence of nine ultrasonic pulses of 10 min, each pulse separated by a pause of 5 min. Practical ApplicationsBetalains (BTs) are a source of red to yellow natural colorants, as an alternative to synthetic ones. Because of their nature, BTs could be lost during the extraction process, requiring for research of optimal extraction methods. The green methodology herein proposed, using mucilage as extracting medium and applying a sequence of nine pulses of 10 min, each pulse separated by a pause of 5 min, allows for a faster extraction of bioactive compounds, without significantly increasing the system temperature, therefore avoiding the use of cooling systems, minimizing costs, without degrading the bioactive compounds, providing an alternative for utilization of waste materials, increasing profits and diminishing waste. The use of an optimal frequency for ultrasound-assisted extraction of bioactive compounds could be easily implemented for industrial or for communal purposes due to the feasibility of customizing ultrasonic transducers.

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“…Absorbances of the final supernatant were measured at 480 and 540 nm using a double spectrophotometer (UVD‐3500, Labomed, Los Angeles, California, USA). The total betalain content was expressed as the sum of betacyanin and betaxanthin contents (Tabio‐García et al ., 2021), calculated according to eqns (7) and (8):

C_{italicbc} (\frac{mg}{100 g}) = \frac{A_{540} \times M_{italicbc} \times V \times 1000 \times 100}{ε_{italicbc} \times L \times m}

C_{italicbx} (\frac{mg}{100 g}) = \frac{A_{480} \times M_{italicbx} \times V \times 1000 \times 100}{ε_{italicbx} \times L \times m}

where C bc , M bc , Ɛ bc are the concentration (mg/100 g), molecular weight (550 g mol −1 ) and mole extinction coefficient (60 000 L mol −1 cm −1 ) of betacyanin; while C bx , M bx and Ɛ bx are the concentration (mg/100 g), molecular weight (308 gmol −1 ) and mole extinction coefficient (48 000 L mol −1 cm −1 ) of betaxanthin; L is the light through the distance (1 cm); V is the extraction volume of betalain (L); and m is the weight of pectin sample in dry basis (g).…”

Section: Methodsmentioning

confidence: 99%

“…Absorbances of the final supernatant were measured at 480 and 540 nm using a double spectrophotometer (UVD-3500, Labomed, Los Angeles, California, USA). The total betalain content was expressed as the sum of betacyanin and betaxanthin contents (Tabio-Garcıá et al, 2021), calculated according to eqns ( 7) and ( 8):…”

Section: Antioxidant Properties Of Pectinmentioning

confidence: 99%

Characterisation of dragon fruit peel pectin extracted with natural deep eutectic solvent and sequential microwave‐ultrasound‐assisted approach

Tien

Khôi

et al. 2022

Int J of Food Sci Tech

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In this research, the physicochemical characteristics (proximate and chemical compositions, monosaccharides profiles, chemical structures, antioxidant activities and rheological properties) of dragon fruit peel pectin extracted with the solvent system of choline chloride-glucose-water (5:2:5) and sequential microwave-ultrasound-assisted approach (PC-MUAE), were evaluated, and then compared with those of the commercial pectin and other products from various extraction methods. No remarkable differences in the FTIR spectra of the commercial and extracted samples were observed, leading to the fact that the derived polysaccharides were pectin. The commercial pectin possessed a bright-yellow colour, while extracted pectin was yellow to brownish. Moreover, the facade of the latter under SEM was rough with miniature heterogeneous fragments. PC-MUAE was categorised as high methoxyl pectin with the degree of esterification of 59.76% and as a pseudoplastic substance with neutral pH (6.42), average level of solubility (73.90%), high equivalent weight (680.6 g mol −1 ), high molecular weight (5.05 × 10 5 Da), high antioxidant activities (total phenolic content of 8.14 mg of gallic acid equivalent/g pectin and 2,2-Diphenyl-1picrylhydrazyl free radical scavenging capacity of 2.41 µmol Trolox equivalent/g pectin) and high viscosity at all tested domains of shear rate as compared with those of the commercial product and others from various methods. The anhydrouronic acid content of PC-MUAE was 64.28%, approximately to the minimum level (65%) proposed by FAO and EU. There were arabinose, galactose, glucose, mannose, rhamnose and xylose detected in extracted pectin. Consequently, PC-MUAE has the potential characteristics of high methoxyl pectin for the food industries.Keywords Antioxidant activities, chemical structures, dragon fruit peel pectin, monosaccharides profiles, physicochemical compositions, rheological properties.

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Optimisation of the ultrasound-assisted extraction of betalains and polyphenols from Amaranthus hypochondriacus var. Nutrisol

Cited by 20 publications

References 68 publications

Trends in sonochemistry and sonoprocessing in North America – Preface

Trends in sonochemistry and sonoprocessing in North America – Preface

Influence of frequency on ultrasound‐assisted extraction of betalains from Stenocereus queretaroensis peel

Characterisation of dragon fruit peel pectin extracted with natural deep eutectic solvent and sequential microwave‐ultrasound‐assisted approach

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